Identification of New β-Delayed γ Rays and a Low-Spin Isomer in ¹⁷⁶Ir

The β⁺/EC decay of doubly odd nucleus ¹⁷⁶Ir has been studied via the ¹⁴⁶Nd(³⁵Cl, 5nγ) heavy ion fusion evaporation reaction at 210MeV bombarding energy. With the aid of a helium-jet recoil fast tape transport system, the reaction products were transported to a low-background location for measurement. Based on the data analysis, the previously known γ rays from the decay of ¹⁷⁶Ir are proven. Moreover, three new excited levels and ten new γ rays are assigned to ¹⁷⁶Os. The time spectra of typical γ rays clearly indicate a long-lived low-spin isomer in ¹⁷⁶Ir.